Glad you are back on the car. Looks great. Looking over the pictures of the exhaust collector, I remembered that flatties vent the crankcase pressure through the filler tube. With that blower you will have the potential to increase this pressure. Most racecars have a scavenging system using the exhaust at the collector to assist in ventilation of the crankcase. Utilizing a check valve so exhaust can't pressurize the crankcase. Just a thought. I could see the vent cap flying off or allowing fine oil mist all over the engine compartment under heavy acceleration.