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Re: carb sizing
The engine will use 600cfm. A 600cfm carb running 600cfm has to be creating some vaccum, which reduces power. A 750 is breathing easier at 600cfm hence the power increase.
OP- For a stock ht383, that won't be upper rpm, a 600cfm carb is plenty. So go with the 670 out of your two choices.
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-78 c10 short/step: 388cid, M20, 5/5 drop, lots more. Playtoy and first vehicle.
-98 c1500 x-cab: 5.7L, 17" rims, 5/6 drop, flowmaster, helper bags,NBS rear disk brakes.
-02 Suburban 4x4: leveled front
-CBR600F4i, CBR600RR, CBR1000RR, and standup skis
DISCLAIMER: I cant spell for the life of me.
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