its engine selection time

[Guyz55]

Ok so I have upgraded my entire brake system on my 55 3100 ....its time ti select a motor ...I am trying to decide on 1 of 3 ...one is a GM 350 that makes 290 HP and it is just about turn key with EFI and an HEI distributor ...Price 3700$$...2nd consideration ...a blue print long block ...base price 2700$ efi $795 , intake 180$, hei distributor,90$ and harmonic balancer 55$....3rd consideration is an ATK 2800$ ....with everything ( intake, harmonic balancer and water pump) except EFI which is $795 .

All 3 are 350's ....1 is brand new ..the GM 350/290 HP ....the atk and the Blueprint are remanufactured.....I was told by summit that both the ATK and the Blueprint are great motors with great warrantys ...the atk makes 325 hp and the blueprint makes 310 ....these 2 are the ones I am considering most strongly because they have the HP im looking for .....

so I am looking for insights, advice, input , any information that would aid in my search for a 350 that makes between 300 and 350Hp....and if you have any knowledge of the motors I have listed ,please let me know what you think ....