340 build

Hope I dont ruffle any feathers here, coudnt have gotten this far with everyones help so far and last thing I want to do is seem as if Im questioning buuuuut.

I cant stop thinking about a few things, mainly post # 61. Too me I cant understand why this would not makes the most sense, Ive got a couple of issues still with this engine.
1- I have the wrong heads, I dont want to sell these, Id be lucky to get 500 bucks for them here locally and Im NOT doing that. I dont have alot of money, never have never will and aluminum heads are a big bragging right I dont want to give up.

2- technically I have a deck surface that isnt flat ( boy thats buggin me, I know that its pretty standard on these older cast iron blocks but too know its there and not do anything about just seems like Im ignoring something ) ( dont ask dont tell crap )

3- When I took the engine apart the intake manifold was LITERALLY glued to the block thick and I MEAN THICK. I pryed and tapped and pryed and tapped and pryed and BEAT on that manifold till I ws blue in the face to remove it.

In the end I ended up cutting it off.

I am thinking that there is an alignment issue, I am thinking that the goop was put there to seal things up AKA a band aid, I dont like band aid.

Im also thinking that the head gasket I pulled out of there was not standard but instead an already extra thick head gasket to try and fix a problem.

Id like to know when I put this thing back together that I am doing the best that I can ( within reason )

Id like some feedback on how I can tell just how much I can cut off the top of these pistons without causing an issue there such as blow thru cause they became too thin.

If I cut the piston down than I could have

A- a flat deck ( let them take the high end down so all the pistons are within reason sticking out the same height
B- I could use a reasonable head gasket ( without getting too crazy )
C- I could use my heads without worry about valves hitting
D- I wouldnt have to goop the heck out of my manifold just to get it too seal.

Can someone tell my where Im wrong ?