The 69 is a no brainer for you. Exactly what you should start with and you already have it! A nice bonus is you can drop ANY drive train you want in it. BB, SB...whatever. And everyone loves a 69 so you'll be a crowd pleaser (attention getter) as well.
that turns so I told him he can't have it for several years now! But yeah, we thought the same thing. It's already cool even in ratty form. Another plus is that I am pulling the C6, crossmember, BBF motor mounts, drive shaft, and other related parts, etc. from the 67 for the TKO swap so I will have a bunch of BBF stuff that will go right into the 69. I'm running the same rear axle in the 67. So I could pick up a 429/460. I do already have a small block and stuff now though so I will start out with that and when I blow that up I can swap in a BBF!