Yes there is an Adapter kit and you may also need an adjustable push rod to go with it.

As for your second question, I had the large bore MP master on mine to start off with. I thought there was a problem with it and put a new, small bore master on it. (couldn't get the large bore from MP any more ) It turned out to be something eles wrong and I put the large bore back on as I wasn't happy with the way the small bore felt.

I think you'ld be happier W/ the larger bore.