351 head questions on my 5.0
 

I have 351 windsor senior heads on my 88 mustang 5.0 and i have no idea what teh port sdizes are on the damn thing. is the 302 intakes and exhaust gonna screw me over with smaller ports or what? the heads have huge bucks into them so i kinda wanna keep them. All info in helpfulk also coudld someone estimate the power loss if teh ports are not matching? Thanks and feel free to add anyhitng . Thanks alot guys