LQ9 vs LS1
But the short answer is either will need the same things. There is no huge difference between them other than the extra 100lbs on the nose from the iron block and you will probably spend more money on the ls1.
Either will top 400rwhp easily, the higher power you want to go the easier it will be with the larger bore, they have the same stroke.
I wonder if the T56 is lighter than whatever was in the car too.
Realistically the car probably had an all iron smallblock heads and intake included so even a LQ4 may be lighter.
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450 rwhp will take a good set of ported heads on top of that

