I have made a three of these TPI intakes now and they have all done well If you would like I can put a few pics on this site so you can see one of them.They work great with the fast burn heads. the fast burn heads are already drilled for an old stile manafold.But work just as well if you drill and tap the vortec heads.

 

I'd like some pics of the intake. Are you porting and drilling them to match the vortec ports and bolt patterns?