727 or 904 which way to go

Grant you'd have to do quite a bit to make it as strong as a 727 cause the 727 parts are so much larger. One big drawback is the smaller diameter of the input shaft and converter hub. Then there are the planetaries. You'd need aftermarket ones to make it as strong as a 727. Nevertheless, you can build a 904 to stand up to 500 hp fairly easy. But the same build on a 727 will take 600 hp. One drawback to consider on a 727 is the larger spinning mass not only eats hp but is more prone to exploding so when you get serious with them you should replace the front clutch drum and add a good bolt in sprague for safety