SS Springs on 75 Duster

These engine are very much a like....but the new one has some advantages to it...

pistons kb741 about 35 grams lighter with 1/16 rings vs SP 116hcp with 5/64 rings..ll
Compression ratio on new is probably 1 full point higher due to taller CH and block being decked for zero deck height.
Rods are about 65 grams lighter.......the pins are probably a few grams lighter too...
New engine is internally balanced stock 3.58 crank....vs externally stock crank...

Both engine have the same camshaft...old MP .571 oval cam....new engine is installed at 102 degrees vs 104 degrees...
rockers are Crane....new has all 1.5 ratio...old have 1.6/1.5 combo....
Both have Speedmaster CNC heads with PAC 1903 springs....
New engine heads are Out of the Box.....old engine has competition valve job done by local machine shop....