If your block would go 4.070 here is a decent forged dish not priced too bad.
https://www.ebay.com/itm/8141-2-12351-070-Chrys-360-Dish-14-5cc-SRS-Pistons-4-070-Bore-1-664-C-H/262408540929?ssPageName=STRK%3AMEBIDX%3AIT&_trksid=p2060353.m1438.l2649
2 reasons.
That piston would put my compression into the 8’s.
Also, The more I steer away from factory 4” bore the more I risk water spitting out into the cyclinder through rusted coolant passages near the cylinder walls.
This happen to Dulcich on roadkill in his 360.
I’m hoping to maintain stock bore size.
I’m also assuming you think that piston is better than the $400 Wisecos I listed above.
Now just need stock bore size and max 5cc valve reliefs.
