318/360 Crank/347 running on Dyno

RAMM said

Good observations. Shorty headers usually make tons of low end at the expense of high rpm power.(I know that is not what we are taught). No comment on the carb because I don't know what you are using now. If it is smaller than a 600 cfm than yes you do. More likely you need more valve spring first. J.Rob

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Thanks for the reply I currently have a vintage Carter AFB 625 cfm on the engine, I'm thinking of getting a ~700 cfm double pumper when I start to hit the track again. The valve springs are the Hughes #1110 I believe they are straight single w/damper, 110# on the seat and 315# at .500" lift or something along those lines so shouldn't be an issue there. As far as the exhaust the headers can't breathe properly as the guy who welded it in (not a performance specialist for sure) used the puny <2" collectors that came with the headers instead of 2.5" like I asked. The downpipes have lots of sharp turns of course and are now smashed up from the road pretty bad.