Is there a rule of thumb for H.P. increase with the increase of compression??

I'm building an engine (302 HO) and can get std. 9.0 comp. pistons for $90.
If I jump to 10.2 comp. the price goes way up!

I'm just wondering if the H.P. increase with higher comp. is worth the price?

The car is a 32 roadster with an AOD-E trans with 2000 stall and a ford 9" rear with probably 4.10 gears if this helps in the equation.