Spoke to a guy at C&C with one. Said it was fun but pretty front heavy. It did sound like he was still setting it up though. Apparently he takes it auto crossing.
There is one guy in MN with screen name Scuba Steve (not Dave)on mnautox forum that has LS1 swapped Miata. Another option would be to build block and turbo it. You could get over 300whp with good size turbocharger and it would be much cheaper than LS1 option.