225 slant 6 or 360 v8

8.00 is plenty quick
8.999 not so much
The point is she will be maxed out, with no room for more, so if it ain't fast enough, your next option is a V8. Again. So you might as well go V8 right from the get-go.
Oh yeah, what gears was the little slanty running again? hi-4s/low-5s?
A V8 will get into the 8s pretty easily and still have great street manners, and if built right will get pretty good fuel economy too.And it might do it at the top of second with like 3.73s or maybe even 3.55s.
The 69 is too heavy for a slanty.
For about the same money, you should be able to get a good running 360 in there, and with nothing more than a 4bbl and a 340 cam,go 14s easy.