1979 Dodge aspen street car build. (How fast?)

SpareParts said
If you choose the "go big" option on cam I have a mean solid roller and all the parts to go with it I'd like to sell. Custom ground from a 4" stroke motor, .630+"

I'm thinking about pulling out my small and reliable 248/254 cam...something bigger would put me in the low 10's.....decisions decisions.