1966 273 Commando - Thoughts

To spin a 273 to 350 hp probably be around 6000 rpms, a 318, 340, 360 probably make around 400, 425, 450 hp respectively at around 6000 rpms and about 160, 190, 200, 210 hp around 3000 rpm for 273, 318, 340, 360 respectively. If built to the same powerband a 273 gonna be down about 50 hp at 3000 rpm and 100 hp at 6000 rpm even though the 360 gonna need more cylinder head, or 360 can make 350 hp around 5000 rpm. Not saying don't build a 300-350 hp 273 it's up to you.