Need help with cam selection

Hello everyone, been a member here for a while but have not been logged in in over 2-3 years. im currently putting my 440 together and the time has come to pick a cam shaft.this will be a street car that I will track often. im not worried about streetability too much. looking for a solid flat tappet suggestion.

440 +.030 4 speed
-forged crank, ly rods, L2295 speed pro pistons which have had dome machined off to be a flat top im roughly 30-40 in the hole
-eddy rpms ported 2.19in 1.8ex
-crane gold 1.5 roller rockers
440 victor intake

im thinking about the .557 purple shaft ,or a custom ground ultra dyne/ bullet. I also have access to a clay smith 304 525lift solid cam, this is my first big block build
some sound clips of set ups would be awesome, thanks this is going in a 67 fastback barracuda for the record
- Stephon