hey im thinking of getting the l31 vortech heads later on but im most likly getting the edolbrock vortec performer manifold first now could i have the vortec manifold on the stock heads on my goodwrench 350 ? or will they only fit on the vortechs??

 

No, you do not have a Vortec intake on your Goodwrench 350. You'll have to get the right one.

The Vortec bolt pattern is different. But more important, the intake ports are in a different place.

 

so the vortech manifold will not fit on the stock heads? because i was planning on having them on the stock heads for a little bit till i got the vortech heads

 

That is correct.

Incidentally, GM's trademark word that means "we moved the intake ports" is "Vortec"; "Vortech" is the company that makes centrifugal superchargers. AFAIK Vortech doesn't make manifolds or heads.