Clint,
I installed the 260 HP/350 crate engine for a customer a couple of months ago. It came from Jegs, delivered for $1560. It was actually more at the local dealer with the tax added. I also installed one a couple of years ago, both run great, I highly recommend them.
Fred

1956 3100 Pickup/Red/350/3sp OD/PS/Disc Brakes
1957 Bel Air Sport Coupe/Red/355/TH350/PS/Disc Brakes
2017 Silverado LT Single Cab SB/Black/5.3/6 Speed Trans
1947 Willys CJ2A w/F-Head engine