Battery in Trunk

1972 Plymouth Scamp, 408 ci, 904 transmission, 8 3/4 Sure Grip rear end, 2 wire square back alt.
I am relocating battery to the trunk. I am using a Ford type solenoid so as to not have constant power running through the positive cable throughout the vehicle at all times. I am not using a disconnect switch as this is for occasional driving. My question is that I have seen the use of a constant duty solenoid on several of the other posts and am wondering if I need this in addition to my solenoid, should use this in place of my solenoid…
Any input will be appreciated.