What are the best upgrades for a 67 Camaro

[blazincopper]

I've been out of the Camaro loop for a while building custom early Broncos and I'm restoring my 67 Camaro again, hopefully for the last time. I need to know what ya'll think are the better custom upgrades for a street rod. I'm not going all out pro-touring, but more of a custom street rod with a pro touring stance. I'm running a 468 bigblock with a elec water pump and drop brackets to help keep the engine compartment looking clean. I want to smooth the firewall and have nothing showing under the hood except the motor. I am going to do late model leather seats, custom dash, and a custom consolem, custom paint, etc.

Some of questions are -
What is the best wiper motor replacement?
What are options for eliminating the heater box, but still have heat?
What are some of the easier late model leather/power seat conversion? ( I need a front and rear seat set or possibly 4 buckets)
Does anyone sell a rubber front and rear window trim kit? (to eliminate the chrome)
Are there real advantages to running tubular A-Arms?
Is there a good inexpensive 4 link set up?
What are the best shocks - coil overs to run with stock suspension?
For an 18" front and 20" rear wheel combo - what are the best width and backspacing to use?
Let me of any other good upgrades ya'll would recommend.

Thanks for you help, I'll post pics of my progress.