Holley question

[427TJ]

'55 Chevy, 327, Duntov solid cam (rumpy idle), MSD mechanical advance dist (no ignition box--has the blue box under the base), Holley Street Dominator intake, supposed to be a 10.5:1 engine, headers, turbos, 4-speed, 4:11s.

Has an ancient Holley 650 spread-bore now that needs rebuilding/replacing.

Is a 650 double pumper (new in box) too much carb?

I re-read the carb section in "How to Hotrod Small Block Chevys" and they say 650 is as big as you want to go for a street/occasional strip SBC. Book also recommends the Holley spread-bore and the vac-secondary units as good street carbs over the double-pumper. I was thinking double-pumper due to the big cam (too big, really).

Recommendations? Thanks in advance!