I've had several 283 powered Chevy II/ Nova's..... It's a good combo.
The 283 is a LOT cheaper to buy and easier to find than a 327 and... the later 305/350/ etc. have the different main seal and will not work with most OEM front sump Nova oil pans.
JW Nova has everything for the swap as does Ebay. I think I might even have an oil pan kicking around.

Also, the powerglide goes right in-- but a TH350 is a btter setup. The TH350 crossmembers are available aftermarket.
I think I used a 70's Camaro Radiator with "L" shaped brackets on my first Nova swap-- saved me a bundle-- hope this helps!