1970 Duster Battery Size?

Group 24 seems like a fit for sure

I have read that Group 27 will also fit?

Group 24; 10-5/8"L x 6-3/4"W x 8-7/8"T
Group 27; 12-1/2"L x 6-13/16"W x 8-15/16"T

My battery tray appears to be 11"L x 7"W

I should be able to clear a battery that is 9" tall

Is the 27 that much better than the 24?

A group 34 looks like it would also fit: 10-1/4"L x 6-13/16"W x 7-7/8"T
Group 34 has a lot of CA/CCA, compared to the Group 24/27