From my 2002 Mopar Performance catalog..
Looks like the only difference is the cam and intake.
Cams
300hp 250/264D 335/401"L
380hp 288/292D 501/513"L
My understanding is that R/T heads never came on the crate motors.

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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