AFR by far. The only head that can compete is Trick Flow twisted wedge. 347 is a good build but I would invest in an aftermarket block. I like DSS since I've had a lot of friends use their parts in the past week with no issues. Their blocks come machined for stroker kits and aren't price to bad either. They have different levels so you can pick the level you want for the HP your looking to hopefully run.
You can't lose if you put God first!
1989 LX, 306 with TF top end kit, Anderson N-21 cam, TKO 600 trans with steel splatter shield,full Maximum Motorsports Mustang maximum Grip box, Detroit locker rear end with 31 spline Moser axles. Staggered wheels with Nitto 555 315/35/17 out back.