http://www.summitracing.com/parts/fem-csmhp732-310/overview/make/ford
This is just one of the general kits, you would need a 4V intake manifold gasket, cam, lifters and timing chain set.
Timing chain sets are usually under 35 bucks.
Before ordering, the block would need to be machined and the crank turned to determine which exact kit you need.
Machinist would also need to resize rod ends and your heads will need to be gone through. I can't emphasize this point enough, the stock ford valves should be replaced with 1 piece valves. Ford valves when they fail destroy your engine. Springs should match your cam choice, so it is usually best to get a cam kit with the matching lifters and springs. A good set of valves will run about 300 bucks. Hydraulic flat tappet cam lifters and spring should be under 300 bucks
I would recommend roller rocker arms as an upgrade of the factory ones, though they are not a necessity. If your rocker arms are not in good condition factory types can be found for a reasonable price. Roller Rocker arms are about 225 a set
Locally, the machine work and balancing for both heads and block tend to run about a grand depending on what you need.
Lots of times, the machine shop will assemble the engine for under $500.00 additional
So components and labor to rebuild your engine would be right at 3K plus whatever you decide to do on the intake and carb and the labor to remove and reinstall.
The problem with buying a rebuilt long block is you will likely get a used or reground cam and the valves are unlikely to be replaced. Often the pistons are original with new rings and the cylinder walls are just honed, so they will not be any better than the worn donor block.
.010 and .020 oversized pistons are more expensive, .030 is pretty much a standard. But your machinist will measure the block and determine what will be best.
Having it done is more time consuming than just buying one, but you should end up with a better and more reliable engine.
