Before I make a mistake please help new mopar fan!!

you know this is going to snowball right? keep in mind the condition of a 40 year old long block, the rings and bores are more than likely not going to be in the best condition to make power reguardless of the original compression ratio. add in the higher compression engines usually didnt have hardened valve seats for unleaded gas, good chance of needing a valve job. you could have the heads decked and run a steel shim gasket to raise the compression. your going to have to do valve springs with your cam swap too.