Hey Leo - I'm a new member as well, and your mention of having a 1967 Firebird reminded me that way back in high school (mid-70's) I pulled a six-cylinder engine out of a 1967 Firebird and dropped in a newly rebuilt 409 with two 4-barrels and ribbed aluminum valve covers. Sadly I only have one picture of the car and no pictures of the engine. I wonder if the car is still on the road today in the San Francisco Bay area. You would know it because I painted the rear cover of the differential orange and glued on a 409 sticker from a bottle of the famous spray cleaner by the same name. It would fool you because it still had the original hood with the emblems that said 4.1 Litre Overhead Cam.
Rob