I've been searching the internet and everything somebody out there please help 350 5.7 L 1986 to 1988 4 bolt main V0308 UPJ. Need no the horsepower ratio everything. thanks

 

There are all the years of tech data at the top of the page, this is for 88

https://www.thirdgen.org/1988-pontiac-firebird/

 

The only difference I could find from mine then from the Corvette and Camaro is that year is they had to Roller cams with the spider thing up underneath the intake mind you got it to where it could be drilled out for it same blocking everything I need to find the horsepower so I can get me a cam for it someone told me that they think it's got like 200 to 300 hp like that stock. came out a 1 ton

 

If you can’t identify the engine off the suffix see the head casting number.
if it’s a 4 bolt main probably from a truck with junk heads.

 

Yup, assuming the 88 motor is still intact such that the stamping code means anything at all, probably a SIGNIFICANT downgrade. Although in 86, AFAIK the only chassis that a 350 came in anyway, was trucks; so that's not gonna be much of a rompin stompin bit-chompin monster either.

All of these comments assuming of course, that the motors in question are never-opened, COMLETELY INTACT virgin untouched engines. Not efffffing likely for abuncha ANTIQUE car parts. Your best bet is to ignore the "codes" and LOOK AT THE ACTUAL PARTS.