I used a 70 340 intake on my 73 so I could use a Carter AFB. A 60's 273 Intake would match you 318 ports on your heads and use the more current Afb/avs or edelbrock Carbs. If you use a 340 or 360 Intake be sure to use the 340/360 Gaskets to seal on the 318 heads. Good Luck