I'm getting ready to do my swap ('85 HO Roller in 66 stang) but am unsure of some things that I'm hoping some of you can shed some light on. I'm already aware I'll have to get a 50oz flywheel and harmonic balancer. What about the distriubutor? Do I have to replace the iron gear w/ a steel gear for use w/ a roller cam? Also, I have a 4spd manual tranny and am planning on buying a new clutch, do I buy a 66 Mustang clutch or an 85 (to match the block), or does it even matter? Anything else I should be aware of that may be problematic when doing the swap? or is it pretty much a straightforward and simple? Performance: The 85 HO Roller block is rated at 210hp and 270torque, my '66 A code was rated at 225hp and 300 or so torque back in it's day. Now I'm aware that they tested the engines in the 60's a different way than they did in the 80's, so how much more powerful do you think the 85 Roller is even though the numbers aren't llisted as being as high? Any input on any of these Q's is greatly appreciated.