Broken Bolt!!! and other problems

1. Went to put my heads on my shortblock and one of the shorter bolts is broken off in the block. I thought i checked all the bolts before i took it to the machine shop but i guess missed one. What can i do?. Do i just drill it out and tap it. Thankfully my head is a 1/2inch bolt head and i was using reducers to you the smaller bolt. So can i just drill it out and tap it to accept a 1/2 inch bolt.

2. when i was checking pushrod length, the polylok only screws on a couple turns adjusted. Ive turned the motor over and the line the rollers leave is not dead center of the valve stem but it is a narrow straight line. I always heard thats all it needs to be is a narrow line. But the problem is the polylok does goin on very far. Just a few threads. Are the pushrods too long. I left the lifters in oil for a week, i thought this was sposed to keep them pumped up, but when i press down on the rocker it depresses.

3. The heads are patriots, milled .30 and the block has been milled .05. So i figured the intake wouldnt line up. I heard it would hit the block and wouldnt touch the heads. But the intake will sit on each head, and there is problem 1/16 of an inch gap between the block and the bottom of the intake. Will this be good with a thick gasket, or does the intake need to be milled.

Thanks for all the help, im frustrated tryin to get this car done.

Yes there is a head bolt broke off in the block. I bought the block off someone, and took it to the machine shop. Didnt notice the broken bolt. I think im going to take it the local shop and have the drill and tap it.

What about the pushrods, is only 3 or 4 turns down on the polylok or do they need to be shorter. They are about 1/4 shorter then the roller rocker studs.