Tom,

Just curious how about a holley 4165 ? Its a Qjet replacement so the primaries are small.

Make a slight mod to your intake pattern to allow use of a spread bore carb... make the carb flange bolt on and then machine the plate to suit 2, 4sq or spreadbore carb's

Or a QJet ? GM put them on some V6 engines.

51 GMC 4.2 turbo
Can't solved today's problems using the same technology/thinking that created them