Having someone do it will be quite expensive since there is more to it than just the engine exchange, doubt it will be a good return on investment at all - especially on a coupe. Unless you have a particular attachment to this car and money is not a primary issue, I would investigate selling it and buying a 289 car if you don't do your own work or enjoying it as a 6 banger which are decent cars in and of themselves albeit not up to the task of a respectable mid-life-crisis. The entire drive train needs to go plus wheels and front suspension work to get you where you need to be. While you are in the front suspension, you will likely want disc brakes and dual master cylinder - get one with it all done, you can be driving it in a month rather than dumping bucketloads of $$$ into a black-hole-mechanic and "issues" for the next 12 - 18 months...