fuel line ?
Stock 340 hook the 3/8 lines up the the stock pump you will be just fine.
If you decide to go with the 3/8 lines on the carter pump you will have to run a regulator to dial the fuel pressure down, mine made 10 psi.
http://www.summitracing.com/parts/crt-m6270/overview/make/plymouth
I have this pump on my modified 340 and it work great.
http://www.summitracing.com/parts/crt-m6866/overview/make/plymouth
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