I have a set of Ross pistons for a 302 It was no problem at all to get them.....but then they don't have a 'T-dome'
The head has a flat combustion chamber I guess they make a lot more of those and understood.

I have and still use Venollia There in LB and I've been buyin pistons since I was 14 there. Be sure you follow Tom's bore clearance spec. I don't think they have a hi-sy forging for that size and you'll need to make the hole really big!

See if he can get you Deves Rings for that bore.....they may seem low tech to you but work much better than Total Seal

Say hi for me tell em I be over after I return...Both Ross and Venolia have really nice people working there Sound like you just got the wrong guy.