Advice Appreciated

Assuming you have a stock 2.76 rear ratio your performance will be limited, but it will do great on the highway! Suggest you keep rear gear ratio and trans type (manual, auto, od) AND driving style/use of vehicle in mind when designing your combo and choosing parts like head, cam etc.

You mention a machinist quoting you 10.5:1 compression, what chamber volume did he figure into that? What pistons is he suggesting using? Swapping heads might change your compression/performance point - especially if he is planning pop up pistons and open chamber heads, if you buy closed chamber heads you'll have a problem

Get with your machinist and work out a total plan that takes the big picture in mind before moving forward in any direction - that will help you choose your parts