I've got two brand new aftermarket HEIs on the bench at home (remember my testing thread on these last month?) They work fine with a Pontiac 350 or 400.
I'll gladly sell you one for less than they cost on Ebay last month. Need to clear the bench for new projects. I'll post pics and links tonight.
'68 428 HO M3 Monster, 4-on-the-floor! Need I say more?