"...ICON IC891-040 pistons and Eagle 6.625 H rods are my best bet but it does take a bite out of my budget..."
IF budget is a major concern, there are a few ways to build, a little cheaper.
(1) Pistons: Go with the SP L2262F40 pistons. If you want dish pistons, a good machine shop can cut a dish in those pistons. Total price of pistons & machine work should be less than the Icon pistons. Lots of guys have posted here about dishing the SP forged pistons.
https://www.ebay.com/itm/Speed-Pro-T...sAAOxyB0VRuHEA
(2) Many have posted that they have run 10:1 CR on pump gas, with no problems, by using a cam with big adv duration, & keeping the ignition advance reasonable. That will save you the price of dishing the pistons. A couple of big duration cams might be a Melling SPC-3 & a Summit 2802.
(3) Go with factory 1.5 rockers, a Summit cam & cheap Jegs lifters(USA made).
https://www.summitracing.com/parts/sum-2801
https://www.jegs.com/i/JEGS/555/20702/10002/-1
(4) If you go with an 068 clone or Summit 2801, you won't need the high priced Crower springs.
https://www.ebay.com/itm/Pontiac-V8-...AAAOSwmrlU0mJ9
https://www.jegs.com/i/COMP-Cams/249/988-16/10002/-1
https://www.ebay.com/p/192751619?iid...8aAo_cEALw_wcB
(5) Use the cheap FP 8518PT head gaskets.
https://www.summitracing.com/parts/f...EaArArEALw_wcB
There is always a rod debate. I had good luck with cast rods, to 6000 in 400's & 5500 in 455's. But, cast rods are now more than 30 years older than when I used 'em. And, I've read that resized rods/ARP bolts now cost over $200. New RPM H-beam rods are $400. So, better, lighter rods are less than $200 higher.
May not help OP. But might help somebody.