One thing leads to another... mean 318?

I bought my duster last year with longer term plans to build a 408 for it. I was going to live with the 318 It came with (Not original to the car) but I didn’t know anything about the engine. So I dig in a bit check the timing chain, pretty sloppy. No worries, pull the heads to check them out, looks like some porting has been done to 360 open chamber heads with 1.95 intake valves. Cc’d the chambers 63 cc not too bad, they’ve been milled. Found out I have a Crower 224/224 cam, but one cam bearing looked a little suspect. Check pistons 0.106 in the hole means low compression about 7.8:1 pistons are 0.030 oversized. Well I’m in this far might as well go deeper.... pull engine, tear it down. Crank has had journals machined 0.010. Mains looked okay, rod bearings down to copper and a couple have some more significant scratches not sure if they will polish out or if it needs to be ground. Cylinders look alright but if I want more compression with kb167’s which travel higher up the cylinder we will need some machine work. So I took it to the machine shop today. We will see if 0.040 will work on the overbore of if I have to go more.
I’ll wait to see what they say about the cylinders and crank and pricing...I also have to consider the rods which have now been in and out a few times and reusing the rod bolts might not be a good idea if I plan on running the motor hard and this isn’t going to be A grocery getter. So with the time and or cost of pressing on and off the pistons, Buying and replacing rod bolts,, resizing I may be better off just buying Aftermarket rods such as eagle which cuts labour down, but adds to the amount of machining needed to bring crank back to balance as aftermarket rods are lighter then factory.
So what started off as a look see may have turned into a full rebuild... but I may be leaning towards building a mean 318... we will see.