440-3 is a 3rd casting.
There a two versions of the 1976-78 452 heads. Standard and the 452 motor home head with the steam ports at the exhaust valves. All the later blocks have larger cooling ports. I've had 1976-78 blocks from cars, trucks and motor homes and were all the same.
72 Satellite Sebring Plus 440, 72 Dart 5.9 4-spd, 68 Valiant, 73 W200, 78 D100 sb, 78 D200, 98 DAKOTA, .
Moparmarks Parts & Restorations
Desert Mopar Metal
Grand Jct. CO
970-261-7039
http://moparmark.com/motormangj@gmail.com
