350 vortec,327,or 350 build?

[impala327blown]

Hello eveyone!
I have a dilema.I am building a 1964 impala I bought with a chevy vortec motor installed.
It has headers,msd ignition,air gap intake,edelbrock carb,and sounds like a mild cam.I have installed 3.56 gears.From what I have been told the motor is built internally.It seems to run damm good but only in the higher rpms 3500- 6000.I'm looking for a better kick in the low to mid rpms for a street car.My question is this: Should I improve on this motor or build one of my other motors? I have a 327 Stock internals,camel hump heads or Stock 1989 350chevy? Also to add to the options I picked up a B&M 144 blower......I was thinking of selling the blower and 327 to build the vortec???? I currently have a turbo 350 trans but am planning to install a muncie 4 speed out of a 66 Impala... I am new to the game so please school me...
Thanks!!!!

 

[grumpyvette]

first verify the current engines really got vortec heads, with the casting number, and casting marks etc.
next the vortec heads are the best youve mentioned , so those are the best choice on any 327-350-383 you build,
and without knowing the true compression, or the current cam, in use, in your current engine,its very difficult to suggest a cam swap. but IVE used this cam (below) in lots of 350 mild builds with good results for fairly heavy cars wanting a bit more than stock power but retaining street manors and relieability

http://crane.carshopinc.com/product_inf ... 916/114132

the 4 speed trans makes for a far more flexible combo, and that would be my choice,.
if your dead set on doing engine mods the 4 speed would be my first choice , but only after I made 100% sure it was in good shape with a close inspection, but do yourself a favor and get a SFI FLYWHEEL and lakewood bell housing

viewtopic.php?f=71&t=447&p=5146&hilit=lakewood#p5146

the added displacement of the 350, will add low rpm torque, but if the 350 needs rebuilding , with new pistons, rods reconditioned, rings,bearings, etc. then you may want to consider building a 383 with a rotating assembly kit as the total cost won,t be a great deal more if you shop carefully