The 250 pump will work fine. If you use the 292 pan also use the 292 pickup. Oil pumps are the same.
Balancer is a press fit, while the motor is out. Drill the snout for a 7/16 fine thread bolt. This will facilitate the use of a balancer installer. Tom
Inliner Member 1716 65 Chevelle Wagon and 41 Hudson Pickup Information and parts www.12bolt.com