Basically a "How long is a string?" question, Steve. I'm guessing a guy with great skills, rebuilding his own motor and transmission, might be able to do it for $5k. A guy paying someone else to do everything could easily spend $100K. "Dropping in a V8" sounds simple enough, but it's way more complicated than that. Let me tell you the mods I had to do to make it work and you can plug in the numbers for parts and labor you think are appropriate according to your skill level. First the footboxes are going to need modification to fit the transmission. Outriggers will need some cutouts to run a dual exhaust and maybe some inner fender modification if you are going to run headers. Not too bad if you can weld, spendy if a body shop has to do it. Motor and transmission mounts will have to be manufactured. Easy for a welder, more expensive if you have to find a fabricator to do it. You'll probably want one of those foam block motors and gutted transmission to figure out where everything has to fit before you start cutting and welding. You'll want a custom aluminum radiator with a big electric fan and shroud to keep it cool. About $600 right there. Motor and tranny are up to you. Maybe you can find something cheap from a 5.0 Mustang, but it may need a rebuild. The Chevy LS motors are becoming popular, but if you plan on using the fuel injection and electronics, that will be complicated. If you don't, figure on a new manifold and carburetor. You'll probably want to buy a new alternator, along with new front dress, water pump, etc. Probably need a new oilpan. Ford used to offer a crate 5.0 for around $5k and a new 5 spd for about $2,400, but I think prices have gone up since the last I looked. Add in a clutch kit, hydraulic slave cylinder and pay to have a shop build you a driveshaft. Might as well throw in a nice shifter while you have your credit card out. They don't make off-the-shelf exhaust. Headers are nice if you can weld and make your own. Otherwise, throw in another 2 grand to have them fabricated, followed by a trip to the exhaust and muffler shop. You'll also need a new clutch master and add in another 1,000 or so trips for miscellaneous hardware, liquids, solvents, paints and whatever pretty jewelry you want to hang off that motor. Plan on upgrading your brakes, take your choice from the relatively inexpensive Toyota truck four piston calipers, right up to wilwood front and rear discs. And if you want to really get into some tire burning starts, you'll want a new rear axle with positraction. Rough estimate if you do some yourself and farm out some . $15-20k. And let's not forget you've probably devalued your Healey by 1/3. Would I do it again? Absolutely, I just love the way my car turned out. But it's not for everyone.