.509 Purple cam in my want to buy 1971 Scamp

.509 Purple cam duration 292 in a streetable car...1971 Plymouth Scamp

I am about to buy a really nice 1971 Plmouth Scamp....it has a 340 with "X" heads..hooker headers that dump into 2 1/2" exhaust and dumps into 40 series flowmaster mufflers...the cam is that dreaded .509 purple cam with 292 duration...any ideas on how streetable this car will be...it has 3.55 suregrip 8 3/4" rear with some MT street radials...front disc brakes and he added line lock....