motor miss FN weird

I had a motor miss from a bout 2months ago.I was reving the car like a dumbass (as it is all stock) it came up to 6grand hit the rev limiter 4 second. And it droped a cylinder and started tapping but then went away,but was still missing. So i was like f it(cuz i dont drive the car anyway(not yet at least).the other day i started looking for what i did,and what i found shocked me.pulled the drivers side valve cover off.(cuz num 4 plug out and was soked with fuel) welp the exhuast rocker stud must have been backing off over time and the rocker came off the valve.The motor is a reman so i think im going 2 retourqe all the studs just for fun.
So my quiestion is< can i put giude plates and old style roller rockers on the factory heads? I dont like them self allihning rockers

another 1. Are the rods and pistons the same as a gen1 sbc? Im guessing the push rod length is the same.
I just pulled the trans 2day(some 1 ran it low on fluid and burnt the 3/4 clutches out

Im gonna get the car going all stock, so i can drive it and see what its all bout before i start doing stuff to it.All my other cars i bought them and yanked the motor and trans right away haha.Its killing me not to do it 2 the t/a.
Just for kicks, I just sold my 84z28 with a big dart headed,solid cam 408 sbc and built 700r4,it was qwik but not to streetable lol.So i sold it in favor of FI to build. And the reason i joined this site