home porting small block heads

Is it worth the time and effort to gasket match the ports,clean up the bolws and polish the chambers on my 1.88 valve J heads ?

Ive never messed with heads before and dont want to go crazy and ruin them, but I figure while they are off there may be a few ponies in there.

Its a pretty mild combo.

It will be in the 9.5:1 range,XE274,LD340 intake 650 Carb, 10" converter 28" tire and 3.91s