Might wanna consider Auto Tec. pistons. They're made from the 4032 material, rather than the 2618 stuff, that race pistons use. It is stated that the 4032 material expands less, therefore requires less piston to cyl wall clearance. Guessing that the cost of pistons with pins will be less than $600, depending on what dealer you buy thru.
http://racetecpistons.com/pages/autotec.php
When I called 'em, they told me I could buy cheaper from some dealers, than directly from them. When I ask, they recommended Shannons Engineering, as one of their high volume dealers. At the time, he priced me some custom 350 pistons for just under $500, shipped.
https://shanonsengineering.com/produ...at-top-pistons
I've read here that Paul Knippen & Paul Carter can also order 'em for you.
https://www.facebook.com/PaulKnippensMuscleMotors/