273 302 318 340 build

I agree LD with going new. I was looking at Melling but thinking high psi. A spring kit for high psi?
Thanks!
I would not use a used oil pump. I always use this one-https://www.summitracing.com/parts/mel-m72/overview/make/dodge
High pressure / High volume oil pumps are not usually necessary on anything but race engines or big clearances.