What weight oil?

Simple question - what weight oil is recommended for a BB mopar motor? Here's the build:

68 Charger - manual steering, torque thrust II 15" wheels
MT ET Street rear tires - 275/60/15
3.55 suregrip
stock a833 tranny w/ hurst comp shifter
sub frame connectors
XHD rear leafs
440 .060 over around 10.3:1 CR - zero deck hieght
eddy dual roller chain
SpeedPro hypereutectic pistons
Eddy RPM heads shaved to 75cc chambers, race valve job, and cleaned up ports
comp roller rockers
comp hi-tech custom push rods
Huhges springs (1106)
hughes hydro cam - 548/555 lift 237/242 duration 108* lobe separation
performer RPM intake
850 Speed Demon carb
Mallory 6AL and Unilite distributor
stock rods and crank
hi-flow oil pump
windage tray
headers
3" exhaust


99% street driven, but I am hitting the track for the day in a little less than a month.

If possible, I'd love to use some thing that is available locally, and doesn't cost an arm and a leg - although if it's going to offer a significant benefit, I'll spend the cash.

Thanks.