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Hey guys , im looking for a complete set of 351c 2v heads , closed chamber preferred , redone valves / springs .would need to be shipped internationally. Thank you

I know absolutely NOTHING about engines. I'm a danish filmmaker, but had a childhood dream of driving a '69 Mustang that came true recently when I purchased a restored '69 Coupe. I'm very happy with it. Everything runs perfectly. I chose this one, because it's totally restored, but am still considering to get more HP and torque. From what I've read changing the Heads and Camshaft will increase it without being too big an operation. So my Coupe has a 302 2V engine, but there has already been made some mods: Edelbrock CFM500 Carburator with Spacers Tri-Y Headers Red Eagle Transmission, Shift Kit HEI Distributor Suspension, Disc Brakes, Oil Pump, Drive Shaft, and a lot more not directly related to the engine. Now if I want to purchase a new set of aluminium heads, I am looking at a set of 185cc AFR, but then some people are talking about the cheaper GT40 heads, but what is the difference? Of course I'd like to go with the less expensive option, but would still like to get as close to 300HP as possible. Looking at Ebay, the AFR is about $1000 more expensive than the GT40, which is quite a lot. Sorry for my ignorance, but hopefully someone can explain it to me as if I was a child. Also which Camshaft should I choose? I do have a mechanic friend that can do the work for me, but he doesn't know about these different options. According to him it's all about experience and community, therefor I ask here :001_unsure: Thanks a lot in advance!

Hey guys, this past weekend i picked up a really nice 351w short block at the swap meet and plan on replacing my 302 with it. I heard I can use my 302 heads if i drill out the holes. However, i would rather get some with better air flow. Im not sure if it would be better (or cheaper) to just take them to a machine shop and get them ported and stuff or just buy some fancy aftermarket ones. Any advice?...