Advice on which heads to use. 360 , 302???

That cam is a bit big for stock 302's but if you do some mild porting in the future they will complement each other very well. As far as intakes go you could find a used Edelbrock Performer for less than $80 and either bolt on the Holley that you have or get a ThermoQuad, rebuild it, then use that. If it's set up right and working properly the TQ will give you much better gas mileage than a Holley.