Conversion is a cakewalk. Just use a "spider" that holds the lifters down in the correct position. It just takes 2 or 3 little drill & tap processes to hold the spider to the block. I've done my own...nothing major to it, but you could have your machinist do it as well.
I just don't have any faith in trying to break in a flat tappet cam these days. With engine oils lacking
zinc and good break in additive going away, roller makes perfect sense. If Keith Craft flattens a cam on the dyno every now and then, then there's a good chance that the average engine builder will too.
Those flat top SRP's....how much valve relief do they have? 4cc?
That cam you picked out would probably work pretty well. When I get all the piston specs, I'll pick out a couple roller cams that will work well for you.
BTW, thanks for your service overseas.