I'm Torn

I have been researching this a lot for my engine. You have to decide what you want to do and what your budget is. You can take your 318 to a 390, you doing the work for about $4500 with decent parts. That keeps the originality under the hood but gives you a lot more go pedal. You would be more if you drop off your 318 at a shop, you would be $5500. For $5k you can buy a warrantied 408 fully dressed from Blueprint. That would be just under 400hp. If you do that you need to plan a little more $$ for brackets etc to fit the 360. So you are probably at $5500 with that option after picking up the incidentals for a 360 with magnum heads.