67-69 Dart swap questions

Hi all, I've always wanted to do a Mopar build and now that I have some extra money I've finally started looking for a car to start with. I primarily want a drag car that I could drive on the street, though gas mileage and comfort isn't necessarily hugely important to me in my young age, but I would like to be able to drive the car to the track and back and to car shows. I've been looking around and decided on trying to find a 68-69 Dart since they're nice and small and not too bad to pick up price-wise compared to Cudas and Challengers and they still look nice. In the long run I am really considering a 5.7 or (preferrably) a 6.1 swap. I intend to use a full junk pull engine complete with harness and computer to keep cost down if I can find one for a resonable price (seen them for around $3000-4000 or so on Ebay). I think I may have found a good starter car, but I had a few questions I wanted to try to condense the answers to in one thread. I've found some of this information scattered around in the forums, but it would be really nice to have it all in one spot.

The car in question is a 67 318 4 speed with an 8 1/4 rear end. This is where my questions begin. Firstly, I know I need a small block K frame for the new hemi swap, but I also know that they made conversion mounts for putting a big block in a slant 6 car. I'm fairly sure the car I'm looking at was originally a 270 (according to a dash badge, forgot to get the VIN to double check), but is it possible that someone could have put a 318 in with the slant 6 k frame (in other words do they make slant 6 to small block conversion mounts or is a new k frame required?) If I do need a new k frame, is there any place that sells original or cheap k frames? I don't necessary want to dish out $1000+ for an AlterKation or similar since I don't really need all the suspension upgrades for drag racing (for the time being at least).

The next question is whether or not it is possible to use the old 4 speed for a new hemi. I thought I read somewhere on the forums that it was possible with a 340 bellhousing and some minor trimming of the input shaft while still using the original trans mount, but can anyone confirm this? Also, I assume the 318 bellhousing would be the same as a 340 (both smallblocks), but is this right?

Next, how long could I expect the rear end to last? Ideally I would put an 8 3/4 in it, but if what's in it will hold out for a while it would be convenient to keep in it so I could work on getting some money back, lol.

Lastly, the likely end result of this all will be a blown hemi. That being said, what sort of boost can I put down a stock 5.7 or 6.1 and still expect to be driving it regularly without replacing all of the internals? I thought I read somewhere on the forums that 10 psi in a 5.7 will be fun for a few passes, but that I may not be driving it home after one of them... I'm aiming for something in the 11's in terms of 1/4 mile times, but it would be awesome if I could dip into the tens without just throwing money at the engine.

Thanks for any help you all can provide. Looking forward to any help I can get to help convince me to get the ball rolling =P.