Ford 460 rear crank extension engine swap
I doing an engine swap in my 1978 F-350 from a 400m to a 460. I'm keeping the NP435 tranny. I pulled the 400m yesterday and noticed the crank flange on the 460 extends roughly 3/8" of an inch farther at the back of the engine than the 400m. L and L sells a flywheel/clutch kit that according to them allows for no modifications and everything bolts up with proper spacing and clearances. I have a couple of questions. Has anyone here used a kit like this and is it as easy as they claim? The clutch from the 400m looks to be a 12" and the one listed on the L and L website doesn't say how big it is (I use this truck for towing my 31 foot 5th wheel) but I suppose I can contact them regarding that, but I'm concerned about the hefty price tag and if the installation would be as easy as they claim. Does anyone here have any knowledge/experience with this? What other options are there? I read somewhere that spacers can be used between the engine & bellhousing but I'm unsure if that will work as well. Can someone with experience with this give me some pointers?
Thanks in advance,