Whats needed for a magnum swap.
Magnum Head Assembly MP# P5007086 (two required)
Magnum rockers, stands, guide plate, and bolts: MP# P4876050 (eight required)
Special length Pushrods: MP# P5007477
Mopar/AMC lifters: Comp Cams #822 or MP4529220
Magnum head bolts: MP# P4876759
Magnum valve covers (desirable, maybe not required)
MP Magnum intake OR
Modified LA intake OR
Bushed and re-drilled heads (to adapt LA intake)
Spark plugs for Magnum heads - I used Autolite #3923
Standard LA gaskets
Throttle cable bracket from MP (only used with vertical drilled intakes)MP# P4876850
Throttle return spring bracket from MP (only used with vertical drilled intakes): MP# P4876313
Some mopar heads info
The 675 is a small 318 head Not closed chamber.. The 587 heads are the 340/360 heads used in 1973/74 up through in some cases 1976. Most OEM 915/587/596/974 CC'd in the area of 72 CC's. None of the above heads are closed chamber heads.
-302's are closed chambered sbc heads. 051's ase closed chamber. Both are poor performers. Might flow 170cfm intake.
323LA RPM type intake and 340hp cam, mopar 360 magnum head swap made 237rwhp at 6100rpm, and 4000rpm 319lb/ft of max torque. Before magnum head swap had 278lb/ft of torque at the same 4000rpm, and 211hp at max 5800rpm with 318 port 051 Heart shaped LA heads.