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If the car is to be driven on the street 80% of the time i would look in to oval ports over square ports. Better low end TQ which is king on the streets.

Something like these:

Street High-Performance Heads



PERFORMER & PERFORMER RPM 454-O

These oval port heads will support over 540 hp with 9.5:1 compression when used as part of the Total Power Package
Unique oval intake port shape produces flow similar to rectangular ports, but the smaller port size provides excellent seat-of-the-pants performance and crisp throttle response
Semi-open chamber design maximizes efficiency with streetable compression ratios
Smaller-than-stock 11/32" valve stems promote excellent flow and lighter valve weight


PERFORMER 454-O
Chamber Size Intake Port Size Valve Sizes (in/ex) Bare (single) Complete (single)
110cc 290cc 2.19"/1.88" #60469 #60479
 
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