Roller Block with Magnum heads???

I have this same combo waiting to be built.

'86 318 roller and '00 5.9 Magnum heads.

The lifters should be the same, and interchangeable.

I also have a Lunati .518 lift (at the Magnum 1.6 rocker ratio) roller cam with a fixed fuel pump snout.

Roller cams can be more efficient than flat tappets and also have steeper lift rates.

Roller lifters also do not wear out very often and can be used on a swapped or new cam (unlike flat tappet).

Since yo do not need to buy new lifters, that money could go towards a (somewhat pricey compared to flat tappet) decent roller cam.