is the intake manifold on a 93 different then a 94 and up?

found one that is ported to a 58 and its a steal at the price, so i was a little curious if it will match up before i buy it.

 

Yes, there are design differences

 

let me reword my question, am i able to use it on my 93z if its off a different year?

 

The later manifolds will bold on but the fuel rail connections are in a different spot and the later fuel rails are different as well. There really any advantage to switching to a later manifold as you can easily port yours to 58mm. I used a 1-1/2" drum sanding roll in a dremel tool and it probably didn't take 2 hours.

 

what kind of HP gains will i be looking at with a 58m intake and 58m TB, ive heard 10rwhp on just the TB alone but didnt know if it was true?

 

unless you are pushing 400 hp you will see little to no gains with a 58mm tb.

 

Yes. Straight swap.