Horsepower change?

If you go to" 8.80s, sneaking up on it" post, the description of my 65 Dart with 550 cubes , 440-1 heads, 926 dyno"d hp ran 8.80 runs with some issues will fill in some details.
On to my question. I made a few changes and am curious what guys think hp will change.
List of changes-
DLC COATED .205 wall PISTON PINS
replaced .180. Wall Manley pins.
Went to 7.1 hbeam long rods , had 6.86. Hbeams in it before.
New slightly lighter pistons from Gibtech
Same L2L coating
Thinner rings had .043, .043, 3-16
Went to .036- .036-3mm
Got rid of gear drive (milodon) went to belt drive.
Had a vacuum pump but never got vacuum
Above 3 inch on dyno. Plan to run 12 to 15 inch vac if possible.
The big change-- replaced Megablock with
New BMP Aluminum block.
Crank is the same Crower with center counter weights. I hope this will limit any horsepower loss due to the change to the aluminum block. That thought is based on the fact that the better Crower center weighted crank drastically reduced cap walk in the megablock with identical tuneup. Also ford Coyote aluminum blocks and I believe LS aluminum motors run them.
So, thoughts on loss or gains?