My 340 is blowing blue smoke

I put my nimbers matching 340 on a stand and built another 340 to have fun with , I guess could have done a 360 blah blah cheaper , blah blah , more torque , blah blahh blah , but I like the sound of 340 , and that's what came in the car originally .
Any of the 3 small blocks can be made to go , your choice , I just happen to really like 340's .