Will not shift out of 1st

I'll admit to not knowing much about autos and can use any advice you guys have. I just drove my car for the 1st time since I began the big block swap 5 years ago. Everything was great except the trans would not shift. I had it in drive and wound it up well past where I thought it should shift. I then put it in 1st and manually shifted to 2nd but it didn't shift.

The trans (727) was rebuilt about 3 years ago. It's got a 2200 converter.

Any thoughts?