new guy with questions

Hey guys! I just joined this forum yesterday, and I will probably have a lot of questions to keep you busy in the coming weeks. I have always been a die-hard Chevy fan, but I have fallen in love with foxbody Mustangs. I don't own one yet, but I plan to buy one in the next few years. I want to build an engine for the car before I buy the car. I plan to start with a FRPP C347 short block. I want to use AFR 185cc complete heads. I want approx. 10.5:1 comp. from this engine. Should I get the 58cc or the 61cc chambers on the heads? I plan to use a Comp Cams XE274HR cam. The springs on the AFR heads say their max lift is .550". Will I be able to use the .555"/.565" lift
XE274HR cam with the valve springs on the AFR heads? My final question for the time being is which intake should I use, FRPP GT-40 or Edelbrock Performer RPM II?

Thanks for the feedback. I have pretty much decided to go with the Edelbrock Performer RPM II intake. This car will be strictly for fun in my free time. I want it to be "mostly" street legal, so I can drive it around town. I will probably do a little bit of drag racing at the track with the car as well, but it will be mainly a street car. I know I want a '87-'93 hatchback. I would prefer it to be a GT, but a LX hatchback would get the job done. I am not a big fan of the coupes, and I don't like any kind of convertible. Thanks again.