you gotta watch the oil pan, it can't hit the crossmember. and everyone i talk to say to use the repu front cover.
i have heard of 12a's being put in repus but you're obviously missing out on hp and torque. you'd be much better off putting a proper 4 port 13b back in there. it CAN be done. if you autocross twice a year you can get mazda parts at COST, including motor parts. ergo a +new+ block can be purchased for around $1000!!!!!
this friday i talked to a friend's wife who works at the dmv and she said she was read an offical dmv memo saying it'll be a 29 year smog exemption in california, therefore the 74's will be exempt next year (2003). yippie@$! this hasn't been publicly released yet.
74 REPU Lawn Green
81 Rx-7 racecar. 12a J-