I am adapting a stock rebuilt Pontiac 350 in a 68 Pontiac Tempest wagon to stock 350 TBI.

I am running an Edelbrock Performer dual plane for a Q-jet.

What would be the best adapter for my manifold?

Anyone WITH experience with these?

I'm looking at these:

INJECT-IT (looks like it is center pattern)

http://www.ebay.com/itm/46mm-1-13-16...dTOZXX&vxp=mtr

HOLLEY (looks like it can be above either the primary or secondary side, does it matter?)

http://www.ebay.com/itm/Holley-17-41...VVit90&vxp=mtr

TRANS-DAPT (read that some don't like the 1/4" thickness do to limited number of threads)

http://www.ebay.com/itm/Trans-Dapt-T...FVAS~M&vxp=mtr

Thanks, Al