From what ive gathered, crate motors can be really hit and miss. QC on them have a lot to be desired. After asking around the same question, i've made the decision of getting an engine built. If you have your heart set on a particular crate engine, maybe get it rebuilt to be on the safe side......which isnt really cost effective. ie- purchase of engine then rebuilding it.

Food for thought i guess.

Cant really offer you any advice on the Munchie though.