Problem with the VTEC is that the car becomes turns into a torque steer monster. This is likely the reason most ppl unload them after a year or two. But I agree with Alex. Your going to be a full year to do a conversion, not to mention out almost 20 - 30 large. Many people start and never finish. Just wait and get a car that already has the VTEC if this is something you must absolutely have. Ive seen the VTEC for as cheap as 15, and upwards of 40 for a real nice finish. That one in Texas looks nice, just get it for 20 and save yourself a ton of time. 

Talk to Tyler @  Gildred Racing. Great people. 

I'd suggest buying one already converted unless you fancy throwing away a pile of cash.

Very few people seem to keep them for very long after they've converted to a Vtec or R1 or Hyabusa etc etc and some real bargains can be had.

Body is the same regardless of auto or manual.
Subframe is slightly wider where the engine mounts.

I doubt that would make a difference with a vtec as the subframe requires big mods anyway.
Not sure about a 75 for a Vtec as that's a MkIII and the sub mounts are different than a 76> (MkIV)

I'm interested in a classic mini. I would love to Vtec swap it. (I know some find this to be a disgrace) I was wondering if the Auto minis were the same as the manual ones in body builds. Making a Vtec swap kit work. I noticed the Autos were usually cheaper so I figured this might be a good option. I want to obviously have a manual at the end of the swap. Im also in California where a mini older than 1975 is not allowed. If I do the swap to a model after 75 and it passed smog could I register it? Any info would be great! I love the community here!