How much diff. will the 848 head make?

[Matt300ZXT]

I picked up a 55-57 Bel Air 235 for my 54 truck yesterday. It's got a casting # of 3836233 with shows 55-57 235 with a Powerglide from the factory, so my motor should have the hydraulic lifters instead of mechanical, even though right now it currently has a 3 speed on the motor.

Now, I have an 848 head on my current 235 that is locked up, so I'm just curious if it's worth the money to pull it off and have the head rebuilt to slap onto the 55-57 Bel Air motor? I know it bumps up compression some but is it even worth the effort and cost of the rebuild process?