Not sure how to identify or if worth trying to find but I thought my "crate" iron rockers were decent. (I would guess it was an early 2000's 426 from mopar)

All very close. Intakes were 1.57 exhaust 1.49 which worked out perfect for me. (and so far working good up to 7,600rpm)

Last edited by INTMD8; 08/03/22 10:21 PM.
69 Charger. 438ci Gen2 hemi. Flex fuel. Holley HP efi. 650rwhp @7250 510rwtq @5700