Best 904 core?

I've got a fairly strong 318/349 stroker that I'd like to hook up to a 904 transmission so I can keep my driveshaft, linkage, etc. What year 904 should I look to rebuild to have decent strength, better gear ratios, etc? The machine shop figures I should make around 425 hp with 10.2 compression and prepped rhs heads. The voodoo cam recommends a 2800 stall converter.