opinions needed regarding available EFI for a small block

My vote is Megasquirt as well. You can do spark/fuel, more tuning options. as long as you can solder building is fairly easy and is probably one of the cheapest options. I am almost done with mine and can post pics or more info if needed,I like the capability to tune for each cell. Fast EFI for its simplicty and self tuning but it is almost twice the price. Megasquirt has the capability to self tune as well by mapping the 02 sensor.