/6 dual exhaust. bad idea?

my 70 dart currently has the original 225 /6. i eventually want to drop in my 360 (needs to be built) and spoke to a guy at an exhaust shop. we discussed a way where i could put dual exhaust on the /6 now, as a Y pipe from 1 pipe to 2, and later cut it after the Y when i drop in the 360 to keep the true duals an mufflers ect

my question it, since i want to go with Flowmaster 40s mufflers, am i in danger of having the /6 sound like a ricer rocket? or will it sound ok? im just tired of how quiet it is, since my 96 dakota i had before the dart was a 3.9 magnum v6 an i had a cutout and it sounded awesome!

if anyone has a 225 /6 with duals like this please if you could include a sound bit. the motor is stock as far as i know, no headers or intake or anything like that

Thanks