Aluminum Engine Block

FRPP carries an Alum. Block part # M-6010-C302.

It might be a good idea, with alum. heads. Cause my promblem is that cast iron and aluminum heat and expand differently....or is that nothing to worry about.
 
Dart

Dart makes aluminum blocks:

Deck heights: 8.2, 8.7, 9.2, 9.5
Bore size: 4.000 or 4.125
Main journals: 302 or Cleveland

All billet steel 4 bolt main caps, center caps are splayed.