Budget tune 318 la

Hi Tommy
let's talk Mechanics
you can't take a flat tappet grind and make it into a roller as the flank of the roller would have to go concave/ inverted and the side load (pressure angle) on the lifter would be too great.
Therefor a good flat tappet cam can give a roller a run for its money as far as duration and lift are concerned (we're not talking race durations here)
so a FT will work just as well
the difference is in reliability and less drag for the roller- not performance
the roller does not require the careful break in and special (for today) oil
I do not think the stock rollers will work in your early block and others have mentioned the fuel pump- there are 3 basic cam cores
one of which would work with electric fuel pump-
IDK if you can tap a early block for the spider but there are aftermarket solutions- IDK if you rollers will work with aftermarket retention solutions
see 67 darts post above
someone must have actually tried this already but lots of things to check