When I looked at it IIRC the bitmasks needed a lot of work, but then I forget if it was the $85 or $DB. Still never sorted them out but have XDF and hack for each but both are titled $85.

Sounds like you are getting a soaking wet intake... then you come off idle rich, then settles in? Open throttle blades as much as you can for very little IAC counts. May want to give up the low idle?

The one I'm doing this week is new 502 cammed and intake but small and dual plane, headers. Said it runs fine just no improvement from old stock 454. Tow rig so should be easy, have an adjustable regulator ready cause it will probably need more fuel.