Yes a 351W will fit. Headers are the biggest issue. I hope your primary tubes are no bigger than 1 5/8". I recently learned on this board that anything larger would be a waste!
The grill is my ivention, in fact, I don´t like the original grill, is my opinion, that picture is very old, the car is now different, I need a new pictures, jeje. The headers are no bigger than 1 5/8, but Im afraid because of the plugs and the engine torque.