400?

A 400 with a 361/383 crank and rods with forged pistons would be my choice . Why: All 361/383 cranks up to 1970 are forged . All 361/383 cranks are neutral balanced . A 400 piston has a larger bore , therefore , is heavier . 361/383/400 rods are dimentionally the same . The 400 rods may be heavier but I'm not sure . To me , a 400 with 383 crank and rods plus .030" overbore makes a sturdy , high revving , torquey package that fits better in an A-body than a RB unit . Just my opinion .