OK cool.
I myself would use performer. But give them both a shot. It can't hurt and well, lets face it, fun.
The carb cfm size is fine. The engine isn't going to gobble down air like crazy. It'll do for now.
Is the distributor a MoPar Performance unit that has an adjustable vacuum advance unit on the side?
I think another 5* would be a better starting point. Vacuum hose off when you set it up. Leave it off for a run down the track. If it pings, back it off alittle.
Now that will be intail timing plus mechanical advance timing only. On the next run, hook up the vacuum hose and see if it pings when you go down the track. IF it pings, back down the timing.If you can adjust it.
IF not, you'll need MoPars quick advance springs for the distributor. This will allow for good intail timing and a quick mechanical advance. You'll need to limit your vacuum advance one way or another. IF it is the MoPar distributor, the 5/16 *I Think it is* allen key will be used to limit the advance or you'll have a stock distibutor and have to retard the timing to avoid a pinging problem.