Originally Posted by vinniekq2
If you want a true 375 hp then use a solid lifter flat tappet or better, advertised duration will be close to 300 with .500 lift, intake centre line and lobe displacement angle tbd
. for a truck,the RPM air gap is good enough and use a 750 carb,1,5/8 headers.
With that combo and those heads any duration more than about 225º at .050" on the intake will be a waste.
The absolute BIGGEST I would go is 225/230, the smallest I'd go is about 210/210. Get all the lift you can with reasonable durability.