1986 Plymouth Conquest TSi Vin N?

I own an 86 Conquest that i got for a steal at $1900 and it's pretty minty fresh. It only has 103,000 miles on it and everything is all original. It has a few minor spots of rust but nothing at all for an 86, the frame and underbody is solid. But down to the point:) I was driving it home from buying it and the guy told me it had a rod knock and that i should sent the crank out soon to get machined and then fitted with oversized bearings. Well aboot a half hour or so of driving, a tiny knock turned into a huge conundrum riddled with plumetting oil pressure, severe turbo lag, and the most ungodly knock ever. I pulled over to check what the hell was up. It managed to overheat because of a loss in oil because a quart or more was gone. Well i decided to spend the $60 to rent a uhaul trailer the next day to stop from hurting her anymore. So after that me and my dad thought the oil pump went out. I took off the valve cover to notice some adjustment screws missing but learned that these were just for the jet valves. We tried adjusting them and noticed that the penger side rockers and one drivers side rocker weren't spitting oil. We further took the rockers off to find that the valve adjustment plugs (i like to call them spring loaded jelly beans) were solid and just knocking on the valve springs, this was the knock. So i bought 8 new ones for $20 a piece, thinking i had the problems all solved. They came the next day and i put them in. I put it all back together and noticed that it would knock, then stop, then knock again and so on. So dad takes the oil cap off to feel the pressure and it's like a damn exhaust pipe on the top end of my motor. There is a pretty plentiful vent of air pushing out of the valve cover. So, we boiled it down to either valves, valve seats, piston rings, or the pcv valve. I took the plugs out and they are all fouled black as hell from burning oil, but it isn't enough for the exhaust to blow smoke, but it does burn oil and it either leaks in through the valves or past the rings. I tested the compression on the rear piston but it was 75 the first time and then 100 the second time. I know that can't be right at all. I figure it's supposed to be around 200 but i'm not sure. Does anyone know how many foot pound of compression i should have per cylinder? I'd like input on this because I can't find any help online and i can't find a repair guide even though that wouldn't help much. Someone told me it could also be some worn seals in my turbo, causing air to run through the oil lines and come out in the valve cover, but i think my compression test shows it's a ring or valve problem. Also, what's the difference between the Vin H model and the Vin N? I feel like and idiot for asking but is there a difference besides a letter? Thank you for any help:) I just really need to know the numbers for my compression in each cylinder. I'm checking all 4 cylinders tonight. Thanks