WildBill 1965 Bill I have not writen a book or make my living from building motors. Here's a couple of ideas
There are a number of FE buildups all over. Barry R. as a nice Book for buildups.
Jay Brown book also has some great info for building a motor.
I started with a 452 motor and have now a 482 animal that is easy on the street. I have my own built FI system that has been run in the car for 15 years. Only failure was me from welding a tab and not unhooking the battery.
My motor is in the real 500/600 club of power. Smaller number is HP.
Barry R. sells a great kit for the 482 in a 427 block. Drops right in with basic checks and assembly work. If you want to send a little more money a steel crank upgrade would be the only thing I would change IF I was turning more than 6,200 rpms max.
Bill from your years of racing, you know that matching the gear ratios in the trans and rearend will get the most out of any motor in the car by kieeping in the 2 power bands.
Not sure how special your block is but if it's the orginial for either car you have, It would get bagged and cosmolined and go into a nice warn corner of the house. Find a boat motor (427) and play with that.
The FI systems are not cheap but IMO are great for street cars and long trips or just cruising, ONCE the computor is setup right or Learns how the motor runs. Fi system does need extra things done unlike a carb with wiring, fuel pump, return fuel line to tank, even a larger supply line to injectors. Bottom line, over build the system.
I have one last motor to build for my car, a 498 with a 58mm TWM setup. Torque monster in the 650-670 torque range and 600 hp. This motor is too must for a cobra. Looking at an over drive trans to handle the power too. T56 with double OD. Thinking of running the car at 200 mph for a jacket. Will have the power, just not sure if the driver will have the B@!!s. Stock body with only windshield angle changed. Something in my bucket list. Good luck with build, you have my number if you want to talk. One thing I will say is this, Run
oil pressure with an #80 spring in the motor and HVHP
oil pump that is blue printed. 7-8 quart
oil pan and over fill it 1 quart. Idle oil pressure a min of 30 psi. Dry sump is also an option. Rick L.