Spoke to holley today, they didnt recommend the spreadbore sniper. Said if my engine made 500hp that sniper wasn't large enough. Possible hp overrated. Spoke to Butler, they say either a sniper 900 or the 1200 cfm unit. While I dont think they are wrong, it is puzzling an engine that uses 600cfm should run best with 900 cfm. Butler thought the torker 2 would be the manifold to use with the efi. The rpm too tall, the factory iron too hard to port to match the 4150 carb openings, and the performer too restrictive for the 469.
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