Indy heads

I'm doing a little homework on these too. Honestly, unless you have a 420" or better, that will make peak power in the 7K range, they are too big for most things. Also, the max diameter intake valve for any bore is 51% of the bore size. that means the usual 4.07 bore 340 based 416 should have an intake smaller than 2.075 or it will suffer shrouding issues. I was looking at W5s, but the best fit for this build I think sill be Edelbrock RPM Magnums with a little cleanup. I have several LA 416 dynoing between 520 and 540 with Ryans stage 3 LA RPMs and mid sized roller cams on pump gas.