What's the appeal of an aluminum engine block?

[Three Peaks]

A lot of very valid points here. When I had my business, (electrical contractor) the one thing I tried hardest to protect was my reputation. With substandard parts in the mix and a demanding customer, you can't be careful enough to avoid every pitfall. And there is always that customer that doesn't understand anything but money and schedule so no excuse in the world will smooth out the lack of trust when a problem comes up.
I worked for free many times to take care of an issue that came up at the last minute so we could meet a schedule or keep a customer happy. Most times the customer never even was aware we did it so he was blissfully happy his project was done on time and on budget.

However, when I have work done I try to use the most experienced and referenced people I can find. For things like engine work I have enough experience to know when I guy is BS'ing me or not. If a reputable builder in just about any field tells me they won't do something because there are issues that aren't worth the effort, they get my attention. When a pro tells me to buy something cheaper, but better, I tend to listen up to his recommendations and ask lots of questions so I understand his reasoning. If it is sound I will usually use that pro for my work as I like to work with honest people. The few times I've disregarded good advice I've paid the price almost every time.

Long story short, if your customers trust you they will strongly consider your recommendations and reasoning. If they don't, no amount of reasoning will sway them around and they are only looking for the bragging rights, IMHO.

As far as the weight issue, I've done a bit of studying and the cast iron FE blocks fully built out are really only about 100-150 lbs heavier than the 351W cast iron blocks built out. With the weight bias in these cars that only totals out to approximately half that additional weight on the front of the car. Not many guys who are street or even autocross drivers are going to notice that amount of difference given proper springs to compensate for the weight and proper set up and alignment on the car, IMHO.

Bob