454 BBC engine build

[Cthibo500]

truck: 81 2wd stepside
engine: 454 out of 78 suburban.
did a tear down everything looked normal, nothing crazy
i'm curious as to how to figure out home much compression i'd be running if/when I decide to go with this rotating assembly

http://www.summitracing.com/parts/sc...05bi/overview/

with these heads

http://www.ebay.com/itm/230838635537...537%26_rdc%3D1

i'm thinking thats going to be way to high of a CR to run on pump gas (91/93)

If its too high i was thinking about going with this set up for a RA

http://www.summitracing.com/parts/sc...05bi/overview/