I’ll tell ya what to do for free tho.
It’s not hard.
The issue most people run into is going too high or wide with the exhaust port, not chamfering everything so it’s like buttery smooth, and forgetting to really clean out all the porting chips from under the piston and ringlands and transfers. Always sink clean with dish soap and scrubbing, I push dish soap covered paper towel balls thru the transfers with chopsticks to really push out the chips.
Then if it’s cast iron dry really fast with compressed air or a heat gun then oil the bore.