Spool vs SG

well i have a delemia...

i need to get my 8.75 into the dart but i can't afford a 500 dollar new sg or a 300 dollar used needs to be rebuilt one either...

but the spools are about 100 dollars.

so my dart is going to be no longer my any weather daily driver. but still will be taken down to the buger shack weekly and driven to the track...

can i get away with the spool is my queston? i know already some will say no way, but i strapped and need to get things moving.

also can i get 4.56's for a 741 case?