Al,
my which aren't worth much .
If primarily street and you want a roller go hydraulic . BUT this will limit rpm to around 6500 max. You may want to go to a 30" tyre , several guys I know run 30" radials on their E bodies
I myself like solid flat tappet because I like simple , plus they don't get wound up with extended traffic idleing . Though can be a gamble with break in . I do not have the same choof your motor does .
Current flat tappet is a custom grind from Crow Cams , nitrided and I use Howards lifters with oil hole .
This is the second motor with Howards lifters , no issues .

Tex