I haven't run either but if I had to choose between the 2, I think I'd go w/ the MSD. That said there is no reason the 440 Source unit shouldn't work. You do understand that with your cubic inches and agressive cam that you will want a "locked" distributor mean it may have to be welded and all your timing should come in full at 2400. I think you should addres the fuel presure problem 1st. if you have too much pressure it will run like poo poo.