Hey, I went by NAPA on the way to work this morning and he swears he can get the 2nd GEN GM HEI (which it appears I have, right?) for about $150 duckies.
I may go that route if these after-market all-in-ones prove to be troublesome.
'68 428 HO M3 Monster, 4-on-the-floor! Need I say more?