Thanks Panky. I haven't got enough to show for a thread of my own but I have a fully rebuilt 283 chev with a towing/torque cam profle mated to a supra 5 speed. The shortened tailshaft (propshaft) is suited for an r160 IRS so I just need to swap over the flanges to a holden and then I'll get the grinder out. My measurements have the front pulley sitting around where the bellhousing is on the stock setup.