I have a port match T2 on the 465 in my 1969 Firebird. It fits under the hood with a small drop base filter and made 580/600 on the dyno without any kind of spacer.
It sits on top of KRE 310cfm d ports.
I don't think you need any more intake than this. My car with a 4l80 and 3.31 gears, it's heavily traction limited in first. I don't pine for torque anywhere with the combination.
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-Jason
1969 Pontiac Firebird
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