the issue with a cleveland is what type of head do you use. the cleveland has the most varity, you have open and closed heads and 2v and 4v heads. the closed heads give the best cr's when used with flat tops. closed chambered head come in 2v and 4v port sizes, the 2v's are from austrailia only and cost @ $350 us. use these for best street torque. the clsoed 4v heads are 1970 and 71, as well as boss 302 heads. you can run 11:1 cr with these heads.
open chambered heads are all us 2v's, and 1972-1974 4v heads. you will have to run a lower cr to keep the pinging down, about 9:1 is max.
the port size is @ 2in intake for 2v heads, and @ 3in for 4v heads. i know i am rounding up. the big complaint is the 351 doesnt flow enogh air at low rpms to make the 4v heads work well, but after 4k rpm, they really come in.
i would say go with the cleveland,cause thats what i raced when i was younger in the early 80's. if you really want to know more, you can email me.