I had used the stock bolts that connect the exhaust manifold to the block, now some of the top four bolts have snapped and some look like they are missing, I have a leak now and I'm going to be in the process to take everything off to fix this problem. First question is: is it ok to drive for a couple of days where it wont do any damage to the engine (the Y band is a little off -i know due to the leak) and what size are those bolts and what would be a good grade to get for those.

 

not fixing them, you risk stripping them all out, if you already haven't. I would be more concerned with figuring out why your ripping them out, rather then a good upgrade. I use stock 10+ year old bolts and no issues. You may want to look into, motor mount upgrades, and a flex pipe.