What year 5M block do you have?
You can only install the 7M crankshaft into a later model 5M block (85/86) because of the #1 main (later blocks have a wider #1 main, early blocks are thinner and the 7M crank won't work)
You'll also need to use the 7MGE/GTE connecting rods and oil pump driveshaft.
That would effectively make it a 6MGE. If you use the domed style pistons, oversized .030" over with intake and exhaust, you'll be looking at around 170hp and 180ft/lbs to the wheels.
You can get the pistons here:
RabidChimp.com - Second Generation Supra Engine Repair and Mainenance
I would look into getting the .030" piston rings elsewhere, as RC only has the chrome ones available and they are a ridiculous price right now. Or you could just go .020" over, bc he has those style rings for $96.
Check supramania.com for a crank, rods & op driveshaft