im sorry a big block ??? that thing must get hot on the frame with all that engine sitting on top of it look at the lines on driver side i think they need to be moved big engine small engine compartment had the same thing with my 548 blown 50 chevy the gas was getting hot all this fits under the stock hood but with the small compartment air dose funny things and my car runs hot some times to so i took the hood off .this did not do any thing i made a air dam is did not do nothing at the end of this i think the air can not get out were i want it to go so i am going to open up the core suport to try to get force more air movement thur the engine compartment this may help you