Horsepower guesstimation?

Wow, thanks for all the replies and advice.
I think I am going to keep the 904 tranny and the 318 as is. The engine runs too well for me to want to change it. I'll try and find someone to trade my rebuilt 727 for an 8 3/4 diff so i can get suregrip going and that should keep me happy for some time!
Cheers!
Heres a photo of my girl and some new kid Ha Ha!