the older style heads have different intake bolt hole angles, but u can slot ur tbi intake holes to make it work, it should b the 4 center bolt holes, 2 on each side,put all sensors and stuff off tbi motor on the older motor, also u have use the older style flywheel, as the tbi style has a wheight on it and wheel throw of the balance of motor, if u use the 88 up flywheel it will beat the babbit outa ur mains and rod bearings,so use oler style, i think thats it