Use a new stock OEM GM SBC oil pump.
Distributor: any good distributor with adjustable vacuum advance is fine.
EG: GM style HEI
For this combo: the distributor set up is real simple,
Simply lock out the mechanical advance curve.
dial in the vacuum advance as required. 15deg max limit.
aprox 10+/- deg added at steady part throttle hiway cruise speeds.
use ported vacuum.