Stock 904 pushbutton hook up to 360

B&M and TCI both offer a flexplate that'll adapt your non weighted converter but that's not your only problem. If you indeed have an old push-button trans. that means the torque converter register (button) that slips into the crank is smaller o.d. than the crank register i.d. and that'll let the converter rock back and forth and break things. I've heard of guys making a spacer to take up the extra and that should work fine.