What would you do?
 

So i have these pics from my stuff:Block i bought used,Guy told me he broke a piston and got a new block.I took it to the machine shop about 3 years ago and had "everything"done to it.I'm hoping to have everything together this spring and running.#1What do you think of the main cap?#2Would you run this head?#3Why was there a "M"Stamped on my main block?#4How do i get those lifter restrictors out(Stripped)?Thanks Guys

I wouldn't use either. I know that's not what you want to hear, but I wouldn't want to put the time and money in them just to worry about them down the road.

Get another core. They aren't hard to find.

Should have posted this when scrap was up! Seriously, I would not even run that block if it was original to my Judge, nor the head. As was already stated, cores are still cheap. Good luck.

Checking block/Pontiac Gregg
 

I have done over 800 Pontiac motors, it's not to bragg, it's so you know the data is good.
Please call me and I will help you .
Colorado
1-303-776-0877

Pontiac Gregg

We would all benefit from your thoughts on this, why not share?

Anything "can" be fixed; the question is whether it's worth the time, money, effort, and enthusiasm.

I don't like what I see in the photos; and I wouldn't use those parts as my first choice. On the other hand, the welded areas are not in heavily-stressed areas of the block. And the restrictors are a drill-bit away from being gone--or--effectively gone.

In particular, after having a "Learning Experience" with some Oldsmobile heads, I am now at the point where I have a very hard time justifying repair to OEM head castings; it's worth some extra money to me to scrap 'em and start fresh with aftermarket aluminum heads. I got lucky, my Olds heads did end up being usable and water-tight--but--it could easily have gone the other way. So now I have 1/2 the cost of aluminum heads invested in compromised castings--and--the front of the car is too damn heavy anyway. What was I thinking?