It depends on what you want and how you want it. FE's are much more expensive to build. The 390 that came it the 67 is rated at 320hp, not exactly phenomenal. The 428 and even the 427 sideoilers are externally identical to the 390 and make lots of power, but it's not a cheap way to go. You'll need some specific parts to put together your big block project, motor mounts, exhaust, a big block tranny (C6) a special cross member and linkage. The 390 is a tire roasting machine but you don't get the high winding run forever powerband of the 289. If you want cheap horsepower, the 289 can get you into 390 power without as much hassle. Either has it's merits and I'm sure you'll be happy with your choice. One last thing, if it matters to you, you'll get alot more raised eyebrows when you drive a big block mustang.
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