What is your current physique like? 4 months isn't that much time to get show ready. If it were me, i would run some sort of a PH right now for roughly 30 days to add some muscle, then take a couple weeks off. Then i would start test and tren to be on cycle during my comp. I'd also add about 50mg of winstrol 2 weeks prior to the show and continue through show. I'd do about 500mg test/wk and like 300mg tren/wk. Switch to Test prop 2 weeks pre show and continue through show. Then, cycle off post show and run PCT.
If that were me and i was likely not in great show condition. I'd also be working very hard on conditioning. Better to show up on the small side but with great conditioning than big and sloppy.