I got my 390/445 kit from Barry at Survival. I went with the H beam rods. There only a hundred dollars more. The fit and finish is a little better. They are also a few grams lighter. If your looking for a Fe block most people like to get the truck blocks because the have extra webbing in the mains. Kinda like a 428cj block. Casting numbers will be either D3TA or D4TA. If my memory is right. Usualy find them in 73-79 Ford trucks. The 360 is the same block as the 390 if you didnt know. Look on Barrys you tube channel. He has several dyno videos with different engine builds. There a a few new heads out for the Fe engine. Like the Survival heads and the BBM heads. These heads are pricey but there making real power. I have the edelbrock heads. Im happy with 450 horsepower. You dont want to push it above 500hp on a two bolt main block. imo..