well guys ive built h series and b series. but never really got into d series. need something to new to build. ive got a z6 motor and also y8 motor both have spun rod bearings. i was thinking about y8 head on the z6 block. but still unsure. what ever i do im boosting. it will not have a stock bottom end. also building the head. im just tryin to figure out which will be the better choice. im also looking for high numbers on the dyno. thanks for any advice!