With mu history of actually getting vehicles running and driving I have come to the conclusion that I will always go with the best option to get the vehicle running and driving ASAP! GO with the 318 and get the car motivating, then if you want more power take your time and find the right engine and build it the way you want!
The funny thing about science is that if you change one miniscule parameter you change the entire outcome to the way you want it.
GO with the 318 and get the car motivating, then if you want more power take your time and find the right engine and build it the way you want! 
